基于危险源理论的煤矿瓦斯爆炸风险评价模型

从固有危险源、诱发危险源和人的因素等3类危险源观点出发，分析了煤矿瓦斯爆炸事故的主要影响因素，构建了瓦斯爆炸危险源风险预警指标体系.应用模糊数学综合评价方法建立了相应的数学评价模型，对矿井瓦斯爆炸危险源进行动态风险评价，确定了矿井发生事故的危险等级，有利于矿井及时采取合理的预警预控措施.最后，结合重庆市中梁山南矿5个采煤工作面的实际情况，进行了采煤工作面危险源风险预警评价，验证了风险评价模型的合理性.     

基于突变级数法的煤矿瓦斯爆炸危险性评价

为防治瓦斯爆炸,将突变理论与模糊数学相结合的突变级数法应用在煤矿瓦斯爆炸灾难危害评价中.从人的因素,机器因素和环境因素3个角度出发,分析煤矿瓦斯爆炸的影响因素,构建瓦斯爆炸危险性评价指标体系,最后运用突变级数法对煤矿瓦斯爆炸危险性进行综合评价.以贵州木孔煤矿为评价实例,得出突变级数法的评价结果为"一般安全",与实际情况一致.研究为防治瓦斯爆炸以及保障矿井的安全生产提供了一条新的思路.     

基于AHP的煤矿瓦斯爆炸事故危险性分析与评价

针对煤矿瓦斯爆炸危险源进行分析和评价,采用模糊综合评价方法,对辨识出的采煤工作面、掘进工作面的危险源,建立评价指标体系,进而建立评价模型,并进行了实例验证。     

采煤工作面特大瓦斯爆炸事故原因分析

采用理论分析法并结合大型煤矿生产的实际,利用矿压、煤炭自燃、采空区瓦斯流场、瓦斯爆炸等理论,对频频发生的煤矿采煤工作面特大瓦斯事故的原因进行了分析,得出了煤矿特大瓦斯爆炸的原因：当采煤工作面上覆岩层大面积垮落时,采空区深部积聚的大量瓦斯被挤出,气流经过煤炭自燃区域时,点燃了浓度在爆炸范围内的瓦斯,因而导致了特大瓦斯爆炸.     

基于危险源理论的煤矿风险评价模型研究

介绍了危险源理论,由此得出了事故发生的一般性条件。分析了煤矿瓦斯爆炸的成因,在两类危险源理论的基础上对煤矿进行了危险源辨识,确定了煤矿瓦斯爆炸危险源。基于危险源理论并考虑人的因素,建立了煤矿瓦斯爆炸危险性评价模型。该模型理论科学,评价指标全面合理,对于开展煤矿危险源辨识和风险评价具有一定的指导意义。     

掘进面瓦斯爆炸危险源安全评价研究

通过危险源理论,分析了煤矿掘进面中瓦斯爆炸危险源,并利用FTA从人、机、环、管理4个方面对危险源进行了分析研究,并最终确定了掘进工作面瓦斯爆炸安全评价指标体系。     

基于三类危险源的掘进工作面瓦斯爆炸模糊综合安全评价

瓦斯事故多发是制约我国煤矿安全生产的最主要因素。依据三类危险源理论,对掘进工作面瓦斯爆炸影响因素进行了辨识、分析,在此基础上建立了基于三类危险源的掘进工作面瓦斯爆炸安全评价指标体系。结合河南某矿掘进工作面的实际情况,运用模糊综合评价法对建立的指标体系进行评价,得出其安全性等级为一般,验证了安全评价指标体系的合理性。     

煤矿瓦斯爆炸事故危险源机理分析及风险评价研究

针对煤矿瓦斯爆炸事故危险源具有多因素复杂性特征,运用对吻鱼骨图分析方式,系统剖析了煤矿瓦斯爆炸事故发生机理及其危害,结合模糊层次分析方法,建立了煤矿瓦斯爆炸风险综合评价模型,并以大同煤矿集团四台煤矿为例,分析验证了该方法对于煤矿瓦斯爆炸事故风险预控的可行性和科学性,从而为煤矿瓦斯爆炸危险源分级管理及安全预警提供了一种理论参考。     

采煤面瓦斯爆炸事故的事故树分析与防治

煤矿瓦斯爆炸事故严重威胁着煤矿企业的安全生产.以采煤工作面瓦斯爆炸事故为例,运用事故树分析法求取了最小割集和结构重要度,分析了采煤面瓦斯爆炸事故的发生原因,并提出了相应的预防措施,为煤矿瓦斯管理提供了科学依据.     

掘进面瓦斯爆炸危险源风险评价研究

应用三类危险源理论,分析了掘进面瓦斯爆炸危险源的组成,依照风险评价原则,合理构建风险评价指标体系。并以四川达竹煤电集团、铜川万兴煤矿为例,结合矿区的实际状况,对掘进面瓦斯爆炸危险源进行风险评价,为煤矿瓦斯治理工作和防止作业面瓦斯聚集提供参考依据。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586